Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Em 1912, quando os EUA usaram safira, qual era a pedra de nascimento hindu?
 ###Tabelas: CREATE TABLE list_of_wisden_trophy_series (list_of_wisden_trophy_series_id AUTO_INCREMENT PRIMARY KEY, Series VARCHAR, Season VARCHAR, Host VARCHAR, Tests INT, England INT, West Indies INT, Draw INT, Series result VARCHAR, Holder at the end of the series VARCHAR) CREATE TABLE season_4_1997 (season_4_1997_id AUTO_INCREMENT PRIMARY KEY, No. in series VARCHAR, No. in season VARCHAR, Title VARCHAR, Directed by VARCHAR, Written by VARCHAR, Original air date VARCHAR, Production code VARCHAR) CREATE TABLE birthstones_by_cultures (birthstones_by_cultures_id AUTO_INCREMENT PRIMARY KEY, Month VARCHAR, 15th- 20th century VARCHAR, U.S. (1912) VARCHAR, U.S. (2013) VARCHAR, Britain (2013) VARCHAR, Hindu VARCHAR) CREATE TABLE premierships_8_62 (premierships_8_62_id AUTO_INCREMENT PRIMARY KEY, Year INT, Opponent VARCHAR, Competition VARCHAR, Score VARCHAR, Venue VARCHAR, Attendance VARCHAR) CREATE TABLE fed_cup_singles_performances_9 (fed_cup_singles_performances_9_id AUTO_INCREMENT PRIMARY KEY, Edition INT, Zone VARCHAR, Round VARCHAR, Date VARCHAR, Against VARCHAR, Surface VARCHAR, Opponent VARCHAR, Outcome VARCHAR, Result VARCHAR)  
SELECT Hindu FROM birthstones_by_cultures WHERE U.S. (1912) = sapphire